单项选择题

I have rung the door bell for five minutes, but no one has come to open the door. The Browns ______ out.

A. should be
B. would be
C. can be
D. must be
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单项选择题
He didn’t thank me for the present. That is ______ annoyed me.
A. which
B. that
C. what
D. how
单项选择题
He ______ TV all afternoon. I can’t get him away from it.
A. watched
B. is watching
C. has watched
D. has been watching
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